#A convex lens forms a real and inverted image of a needle at a distance of 50cm from it. Where is the needle placed in front of the convex l
Text
"Answer:
m = –1, v = +50, u = ?
m = v/u
-1 = 50/u
u = 50/(-1)
u = -50
Using lens formula,
1/f = 1/v - 1/u
= 1/50 - 1/(-50)
= 2/50
f = 25cm
Power of lens, P = 1/f
= 100/25 m-1
= +4 D"
#A convex lens forms a real and inverted image of a needle at a distance of 50cm from it. Where is the needle placed in front of the convex l#find the power of the lens.
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